And as shown by the description of the New covenant and the description of the kind of laws that were abrogated, and by His contrasting reiteration of 9 of the 10 commandments, absent the 4th, God knows how to manifest in what way the new cov. was "Not according to the covenant that I made with their fathers," and what manner of laws were typological shadows, which type the 7th day sabbath corresponds to by nature, and is. "For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world." (Hebrews 4:3)
But while it is incongruous that the 4th commandment not be repeated if keeping it was a salvific issue, all the while statements are given that make sabbath-keeping part of the ceremonial law, and we are to walk in the light of the new covenant, yet you do not simply allow him that "regardeth one day above another" to do so unto the Lord," (Rm. 14:5,6) but condemn all who do not keep the 7th day in the light of what is taught under the new covenant.
Thus only 7th day sabbath keepers are saved, which is a mark of a cult, and which adherents often are looking for a way to exalt themselves over the competition. However, it is unlikely you believe the lost will suffer eternal torment either, but which is what i fear for those who exclude all from salvation who do not keep the 7th day.
There is nothing “ceremonial” or “shadow”y about the Sabbath. It was a straight-forward commemoration of the Creation of the universe. A pretty awesome event. We are given this one day to worship God and His Goodness and reflect on our duties to Him. You have free will. Take a pass if you wish.